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                    <i class="far fa-calendar-minus fa-fw"></i>发布日期:&nbsp;&nbsp;
                    2021-06-30
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                <p>Vue.extend<br>extend:拓展,延伸;<br>官方定义为:使用基础 Vue 构造器,创建一个子类;参数是一个包涵组件选项的对象;就是预设部分选项的 Vue 实例构造器;</p>
<pre class=" language-html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>mount-point<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span></code></pre>
<pre class=" language-javaScript"><code class="language-javaScript">// 创建构造器
var Profile = Vue.extend(&#123;
  template: '<p>&#123;&#123;firstName&#125;&#125; &#123;&#123;lastName&#125;&#125; aka &#123;&#123;alias&#125;&#125;</p>',
  data: function () &#123;
    return &#123;
      firstName: 'Walter',
      lastName: 'White',
      alias: 'Heisenberg'
    &#125;
  &#125;
&#125;)
// 创建 Profile 实例，并挂载到一个元素上。
new Profile().$mount('#mount-point')</code></pre>
<p>结果如下:</p>
<pre class=" language-html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span><span class="token punctuation">></span></span>Walter White aka Heisenberg<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">></span></span></code></pre>
<p>使用步骤:</p>
<ul>
<li><ol>
<li>先用 Vue.extend()创建一个 Vue 的实例构造器(构造函数);</li>
</ol>
</li>
<li><ol start="2">
<li>通过 new Vue 的实例构造器 实例化一个 Vue 实例;</li>
</ol>
</li>
<li><ol start="3">
<li>通过$mount 方法挂载到对应的 el 上;</li>
</ol>
</li>
</ul>
<h4 id="个人理解"><a href="#个人理解" class="headerlink" title="个人理解"></a>个人理解</h4><p>其实 Vue.extend 其实也是用于封装或者创建一个组件;但是有些不同于我们在 components 中新建的组件;<br>Vue.extend 一般用于封装全局组件,并且不像常规 components 那样需要先 import 进来,然后注册挂载;<br><code>Vue.extend封装的组件一般是通过函数调用,类似于element UI中的this.$message;不需要引入并挂载(实际上已经挂载在Vue.prototype上),可以在任意地方直接调用</code></p>
<h4 id="手动一个全局的-message-组件"><a href="#手动一个全局的-message-组件" class="headerlink" title="手动一个全局的 message 组件"></a>手动一个全局的 message 组件</h4><pre class=" language-html"><code class="language-html">// 测试的话 建议直接复制粘贴
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>template</span><span class="token punctuation">></span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">v-if</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>show<span class="token punctuation">"</span></span> <span class="token attr-name">ref</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>modal<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>ek-modal_wrap<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>ek-modal-content<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>modal-title-wrap<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>modal-title<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token entity" title="&#123;">&amp;#123;</span><span class="token entity" title="&#123;">&amp;#123;</span> title <span class="token entity" title="&#125;">&amp;#125;</span><span class="token entity" title="&#125;">&amp;#125;</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>slot</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>description<span class="token punctuation">"</span></span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>slot</span><span class="token punctuation">></span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>modal-button<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span>
          <span class="token attr-name">v-if</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>confirmVisible<span class="token punctuation">"</span></span>
          <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>contral-btn confirm-btn<span class="token punctuation">"</span></span>
          <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>javascript:;<span class="token punctuation">"</span></span>
          <span class="token attr-name">@click</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>confirm<span class="token punctuation">"</span></span>
          <span class="token punctuation">></span></span><span class="token entity" title="&#123;">&amp;#123;</span><span class="token entity" title="&#123;">&amp;#123;</span> confirmText <span class="token entity" title="&#125;">&amp;#125;</span><span class="token entity" title="&#125;">&amp;#125;</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span>
        <span class="token punctuation">></span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span>
          <span class="token attr-name">v-if</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>cancleVisible<span class="token punctuation">"</span></span>
          <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>contral-btn cancle-btn<span class="token punctuation">"</span></span>
          <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>javascript:;<span class="token punctuation">"</span></span>
          <span class="token attr-name">@click</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>cancle<span class="token punctuation">"</span></span>
          <span class="token punctuation">></span></span><span class="token entity" title="&#123;">&amp;#123;</span><span class="token entity" title="&#123;">&amp;#123;</span> cancleText <span class="token entity" title="&#125;">&amp;#125;</span><span class="token entity" title="&#125;">&amp;#125;</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span>
        <span class="token punctuation">></span></span>
      <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>template</span><span class="token punctuation">></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">></span></span><span class="token script language-javascript">
  <span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
    <span class="token function">data</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
      <span class="token keyword">return</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
        show<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
        title<span class="token punctuation">:</span> <span class="token string">""</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true">// 标题</span>
        confirmText<span class="token punctuation">:</span> <span class="token string">"确定"</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true">// 确认文字</span>
        confirmVisible<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true">// 是否展示确认按钮</span>
        onConfirm<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
          <span class="token comment" spellcheck="true">// 确认执行函数</span>
          <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">$emit</span><span class="token punctuation">(</span><span class="token string">"confirm"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
        cancleText<span class="token punctuation">:</span> <span class="token string">"取消"</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true">// 取消文字</span>
        cancleVisible<span class="token punctuation">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span> <span class="token comment" spellcheck="true">// 是否展示取消按钮</span>
        onCancle<span class="token punctuation">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
          <span class="token comment" spellcheck="true">// 取消执行函数</span>
          <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">$emit</span><span class="token punctuation">(</span><span class="token string">"cancle"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
      <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">;</span>
    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
    methods<span class="token punctuation">:</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
      <span class="token function">confirm</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">onConfirm</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
      <span class="token function">cancle</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">onCancle</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
      <span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>show <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>$refs<span class="token punctuation">.</span>modal<span class="token punctuation">)</span> <span class="token operator">&amp;</span>#<span class="token number">123</span><span class="token punctuation">;</span>
          <span class="token keyword">this</span><span class="token punctuation">.</span>$refs<span class="token punctuation">.</span>modal<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment" spellcheck="true">// 关闭时候直接移除当前元素</span>
        <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span>
      <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
    <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">,</span>
  <span class="token operator">&amp;</span>#<span class="token number">125</span><span class="token punctuation">;</span><span class="token punctuation">;</span>
</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">></span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>style</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>scss<span class="token punctuation">"</span></span> <span class="token attr-name">scoped</span><span class="token punctuation">></span></span><span class="token style language-css">
  <span class="token number">.</span>ek-modal_wrap &amp;<span class="token hexcode">#123</span><span class="token punctuation">;</span>
    <span class="token property">position</span><span class="token punctuation">:</span> fixed<span class="token punctuation">;</span>
    <span class="token property">top</span><span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">;</span>
    <span class="token property">left</span><span class="token punctuation">:</span> <span class="token number">0</span><span class="token punctuation">;</span>
    <span class="token property">z-index</span><span class="token punctuation">:</span> <span class="token number">999</span><span class="token punctuation">;</span>
    <span class="token property">width</span><span class="token punctuation">:</span> <span class="token number">100%</span><span class="token punctuation">;</span>
    <span class="token property">height</span><span class="token punctuation">:</span> <span class="token number">100%</span><span class="token punctuation">;</span>
    <span class="token property">font-size</span><span class="token punctuation">:</span> <span class="token number">28</span>px<span class="token punctuation">;</span>
    <span class="token property">background</span><span class="token punctuation">:</span> <span class="token function">rgba</span><span class="token punctuation">(</span><span class="token number">0</span>, <span class="token number">0</span>, <span class="token number">0</span>, <span class="token number">0.7</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token number">.</span>ek-modal-content &amp;<span class="token hexcode">#123</span><span class="token punctuation">;</span>
      <span class="token property">position</span><span class="token punctuation">:</span> fixed<span class="token punctuation">;</span>
      <span class="token property">top</span><span class="token punctuation">:</span> <span class="token number">50%</span><span class="token punctuation">;</span>
      <span class="token property">left</span><span class="token punctuation">:</span> <span class="token number">50%</span><span class="token punctuation">;</span>
      <span class="token property">min-width</span><span class="token punctuation">:</span> <span class="token number">7.2</span>rem<span class="token punctuation">;</span>
      <span class="token property">overflow-x</span><span class="token punctuation">:</span> hidden<span class="token punctuation">;</span>
      <span class="token property">overflow-y</span><span class="token punctuation">:</span> hidden<span class="token punctuation">;</span>
      <span class="token property">text-align</span><span class="token punctuation">:</span> center<span class="token punctuation">;</span>
      <span class="token property">background-color</span><span class="token punctuation">:</span> white<span class="token punctuation">;</span>
      <span class="token property">border-top-left-radius</span><span class="token punctuation">:</span> <span class="token number">0.266667</span>rem<span class="token punctuation">;</span>
      <span class="token property">border-top-right-radius</span><span class="token punctuation">:</span> <span class="token number">0.266667</span>rem<span class="token punctuation">;</span>
      <span class="token property">border-bottom-right-radius</span><span class="token punctuation">:</span> <span class="token number">0.266667</span>rem<span class="token punctuation">;</span>
      <span class="token property">border-bottom-left-radius</span><span class="token punctuation">:</span> <span class="token number">0.266667</span>rem<span class="token punctuation">;</span>
      <span class="token property">transform</span><span class="token punctuation">:</span> <span class="token function">translate</span><span class="token punctuation">(</span>-<span class="token number">50%</span>, -<span class="token number">50%</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token number">.</span>modal-title-wrap &amp;<span class="token hexcode">#123</span><span class="token punctuation">;</span>
        <span class="token property">display</span><span class="token punctuation">:</span> flex<span class="token punctuation">;</span>
        <span class="token property">flex-direction</span><span class="token punctuation">:</span> column<span class="token punctuation">;</span>
        <span class="token property">flex-grow</span><span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">;</span>
        <span class="token property">justify-content</span><span class="token punctuation">:</span> center<span class="token punctuation">;</span>
        <span class="token property">min-height</span><span class="token punctuation">:</span> <span class="token number">55</span>px<span class="token punctuation">;</span>
        <span class="token property">padding</span><span class="token punctuation">:</span> <span class="token number">0</span> <span class="token number">20</span>px<span class="token punctuation">;</span>
        <span class="token property">color</span><span class="token punctuation">:</span> <span class="token hexcode">#333</span><span class="token punctuation">;</span>
      &amp;<span class="token hexcode">#125</span><span class="token punctuation">;</span>
      <span class="token number">.</span>modal-title &amp;<span class="token hexcode">#123</span><span class="token punctuation">;</span>
        <span class="token property">display</span><span class="token punctuation">:</span> flex<span class="token punctuation">;</span>
        <span class="token property">flex-direction</span><span class="token punctuation">:</span> column<span class="token punctuation">;</span>
        <span class="token property">flex-grow</span><span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">;</span>
        <span class="token property">justify-content</span><span class="token punctuation">:</span> center<span class="token punctuation">;</span>
        <span class="token property">min-height</span><span class="token punctuation">:</span> <span class="token number">100</span>px<span class="token punctuation">;</span>
        <span class="token property">margin-top</span><span class="token punctuation">:</span> <span class="token number">30</span>px<span class="token punctuation">;</span>
        <span class="token property">margin-bottom</span><span class="token punctuation">:</span> <span class="token number">30</span>px<span class="token punctuation">;</span>
        <span class="token property">font-weight</span><span class="token punctuation">:</span> <span class="token number">600</span>px<span class="token punctuation">;</span>
        <span class="token property">line-height</span><span class="token punctuation">:</span> <span class="token number">50</span>px<span class="token punctuation">;</span>
        <span class="token property">color</span><span class="token punctuation">:</span> <span class="token hexcode">#333</span><span class="token punctuation">;</span>
      &amp;<span class="token hexcode">#125</span><span class="token punctuation">;</span>
      <span class="token number">.</span>modal-button &amp;<span class="token hexcode">#123</span><span class="token punctuation">;</span>
        <span class="token property">display</span><span class="token punctuation">:</span> flex<span class="token punctuation">;</span>
        <span class="token property">line-height</span><span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">;</span>
        <span class="token property">color</span><span class="token punctuation">:</span> <span class="token hexcode">#333</span><span class="token punctuation">;</span>
        <span class="token property">border-top-color</span><span class="token punctuation">:</span> <span class="token hexcode">#e7e7e7</span><span class="token punctuation">;</span>
        <span class="token property">border-top-style</span><span class="token punctuation">:</span> solid<span class="token punctuation">;</span>
        <span class="token property">border-top-width</span><span class="token punctuation">:</span> <span class="token number">1</span>px<span class="token punctuation">;</span>
        &amp; > a &amp;<span class="token hexcode">#123</span><span class="token punctuation">;</span>
          <span class="token property">color</span><span class="token punctuation">:</span> <span class="token hexcode">#333</span><span class="token punctuation">;</span>
        &amp;<span class="token hexcode">#125</span><span class="token punctuation">;</span>
        <span class="token number">.</span>contral-btn &amp;<span class="token hexcode">#123</span><span class="token punctuation">;</span>
          <span class="token property">flex-basis</span><span class="token punctuation">:</span> <span class="token number">0%</span><span class="token punctuation">;</span>
          <span class="token property">flex-grow</span><span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">;</span>
          <span class="token property">flex-shrink</span><span class="token punctuation">:</span> <span class="token number">1</span><span class="token punctuation">;</span>
          <span class="token property">font-weight</span><span class="token punctuation">:</span> <span class="token number">600</span>px<span class="token punctuation">;</span>
          <span class="token property">line-height</span><span class="token punctuation">:</span> <span class="token number">3</span><span class="token punctuation">;</span>
          <span class="token property">text-align</span><span class="token punctuation">:</span> center<span class="token punctuation">;</span>
          &amp;<span class="token number">.</span>cancle-btn &amp;<span class="token hexcode">#123</span><span class="token punctuation">;</span>
            <span class="token property">border-left-color</span><span class="token punctuation">:</span> <span class="token hexcode">#e7e7e7</span><span class="token punctuation">;</span>
            <span class="token property">border-left-style</span><span class="token punctuation">:</span> solid<span class="token punctuation">;</span>
            <span class="token property">border-left-width</span><span class="token punctuation">:</span> <span class="token number">1</span>px<span class="token punctuation">;</span>
          &amp;<span class="token hexcode">#125</span><span class="token punctuation">;</span>
        &amp;<span class="token hexcode">#125</span><span class="token punctuation">;</span>
      &amp;<span class="token hexcode">#125</span><span class="token punctuation">;</span>
    &amp;<span class="token hexcode">#125</span><span class="token punctuation">;</span>
  &amp;<span class="token hexcode">#125</span><span class="token punctuation">;</span>
</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>style</span><span class="token punctuation">></span></span></code></pre>
<p>在 Vue 原型上绑定方法</p>
<pre class=" language-javaScript"><code class="language-javaScript">import Vue from 'vue';
import dialog from './components/Dialog.vue';
function showDialog(options) &#123;
    const Dialog = Vue.extend(dialog); // 返回一个vue子类
     //创建实例并且挂载
    const app = new Dialog().$mount(document.createElement('div'));
    //初始化参数
    for (let key in options) &#123;
        app[key] = options[key];
    &#125;
    //将元素插入body中
    document.body.appendChild(app.$el);
&#125;
Vue.prototype.$showDialog = showDialog; //将方法放在原型上。
</code></pre>
<p>直接调用</p>
<pre class=" language-javaScript"><code class="language-javaScript">// ....某vue页面

  mounted() &#123;
        console.log(this.$showDialog);
        this.$showDialog(&#123;
            title: '测试弹窗',
            confirmText: '希望弹出窗口正确调用',
            cancelVisible: false,
        &#125;);
    &#125;,
</code></pre>
<h4 id="总结"><a href="#总结" class="headerlink" title="总结:"></a>总结:</h4><ol>
<li>Vue.extend()获得的是一个构造函数,通过 new 该构造函数可以生成一个 Vue 实例;</li>
<li>然后调用$mount 方法将 Vue 实例挂载到对应的 el 上;</li>
<li>就可直接调用或者显示;</li>
</ol>
<p>思考:和 Vue.componnents 有什么不同;<br>**Vue.extend 创建的是编程式的组件;可以直接通过 js 去调用;**不需要 import 进来和注册挂载;可直接使用;并且可以直接通过编程式的方式调用,类似 this.$message 直接方式;</p>
<p>2021..24 复习<br>实际上 Vue.extend()其实是构造了一个构造函数(也是一个 Vue 实例),然后通过$moute 挂载到 el 上;也其实是一个类似的组件;<br>element UI 框架中的 dialog 组件就是通过 Vue.extend 方式挂载上去的;</p>
<h4 id="为什么要使用-extend？直接用-components-不香吗？"><a href="#为什么要使用-extend？直接用-components-不香吗？" class="headerlink" title="为什么要使用 extend？直接用 components 不香吗？"></a>为什么要使用 extend？直接用 components 不香吗？</h4><p>在 Vue 项目中,我们有了初始化的艮实例后,所有的页面都是基于 router 管理,组件也是通过 import 来进行局部注册;但是会有以下几个缺点</p>
<ul>
<li>组件模板都是事先定义好的,如果要从接口动态渲染组件如何？</li>
<li>所有的内容都是在#app 下渲染,注册组件都是在当前位置渲染;如果我要实现一个类似 window.alert()提示组件,并且要求像 JS 那样直接调用;<br>这时候 Vue.extend()就比 components 要好了;</li>
</ul>
<p>所有 <code>Vue.extend()最重要的是可以创建一个编程式的组件,直接通过 JS 去调用;</code></p>

                
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